I don't own a robotic vacuum, but two racks. They seldom end up in the exact same position every time, are frequently moved between rooms depending on state of

I don't own a robotic vacuum, but two racks. They seldom end up in the exact same position every time, are frequently moved between rooms depending on state of drying, weather, and so on. Not to mention the kids. I can't imagine spending effort exactly mapping the location of a rack, a passive/permanent solution like the one in the article is just right.